A smiling Naomi Osaka breezed past Coco Gauff to reach the quarter-finals of the US Open on Monday, saying a happier mindset is behind her best Grand Slam performance for four years.

The Japanese four-time Grand Slam dominated American third seed Gauff on her way to a 6-3, 6-2 victory in a surprisingly lopsided battle of former champions.

The victory sends Osaka into her first Grand Slam singles quarter-final since she reached the last eight of the 2021 Australian Open - a tournament she went on to win.

The 27-year-old, who in the past has been open about her battles with anxiety and depression, said she had set out to make this year's US Open a happy experience.

"What I want to take away from this tournament is just smiling and having fun," Osaka said, adding that her mood improved wh

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